Przelewy24 REST API

The Przelewy24 REST API (v1) provides endpoints for registering and verifying payment transactions, retrieving available payment methods, processing card payments with optional 3D Secure authentication, initiating refunds, and querying transaction details by session ID. Authentication uses HTTP Basic Auth with the merchant's POS ID and API key, and transaction integrity is secured via SHA-384 signatures using the merchant CRC key.